Abstract
Modern agriculture values the most sustainable and dynamic means of production, which can be promoted through the association between coffee and tree components, aiming at the best use of the land. However, within our understanding of the physiological and biochemical behaviors of the coffee tree, the irradiance limiting conditions are crucial to maximize the potential gains generated in these systems. In this sense, the objective of this study was to evaluate the effects of different levels of irradiance restriction on the physiological and biochemical characteristics of two genotypes of Conilon coffee. The experiment was conducted in a 2 × 3 factorial scheme, corresponding to two Conilon coffee clones and three levels of light intensity restriction (0, 30 and 50%), in a randomized block design with four replications. The synthesis of total chlorophyll b and the leaf N content of the genotypes CL6 and CL12 increased with the reduction of light. On the other hand, there was a reduction in the levels of carbohydrates, amino acids and phenols with the reduction of light intensity. Restricted levels of irradiance caused different changes in the physiological and biochemical characteristics of the studied genotypes, showing genetic divergences between them
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